EP0908986A2 - Disque amplificateur laser et procédé de contrÔle du collage du disque - Google Patents
Disque amplificateur laser et procédé de contrÔle du collage du disque Download PDFInfo
- Publication number
- EP0908986A2 EP0908986A2 EP98402363A EP98402363A EP0908986A2 EP 0908986 A2 EP0908986 A2 EP 0908986A2 EP 98402363 A EP98402363 A EP 98402363A EP 98402363 A EP98402363 A EP 98402363A EP 0908986 A2 EP0908986 A2 EP 0908986A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cladding
- film
- adhesive film
- laser amplifier
- glue
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims description 19
- 239000005365 phosphate glass Substances 0.000 claims abstract description 8
- 239000011521 glass Substances 0.000 claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000003071 parasitic effect Effects 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000010949 copper Substances 0.000 claims abstract description 5
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 4
- 239000003822 epoxy resin Substances 0.000 claims abstract description 4
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 4
- 238000005253 cladding Methods 0.000 claims description 25
- 239000002313 adhesive film Substances 0.000 claims description 12
- 239000003292 glue Substances 0.000 claims description 11
- 230000007547 defect Effects 0.000 claims description 10
- 239000013307 optical fiber Substances 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims 2
- 229910019142 PO4 Inorganic materials 0.000 claims 1
- 239000010452 phosphate Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 241001639412 Verres Species 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 244000045947 parasite Species 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/0604—Crystal lasers or glass lasers in the form of a plate or disc
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/17—Solid materials amorphous, e.g. glass
- H01S3/175—Solid materials amorphous, e.g. glass phosphate glass
Definitions
- the technical field of the present invention is that of laser amplifier discs and control of the cladding of these discs.
- a another parasitic phenomenon comes from the photons emitted parallel to the surfaces of the discs, which will normally reflect on the surface of the slice of discs. In the same way, the phenomenon can last indefinitely if the reflection losses on the edge discs are less than gain. That's the reason for which it has been proposed to make a cladding of amplifier discs with an inclined trap letting these photons pass beyond the discs without possibility of return.
- the purpose of the present invention is to provide a new amplifier disc, as well as a method of control of it.
- the invention proposes a disc laser amplifier comprising a phosphate glass doped with neodymium and a cladding made of a phosphate glass doped with copper to trap stray photons, disc being characterized in that the assembly of the two glasses is obtained using an adhesive film having a thickness between about 5 and 35 ⁇ m.
- the adhesive film is made up with a layer of epoxy resin with a thickness included between around 20 and 30 ⁇ m, for example around 25 ⁇ m approx.
- the camera used is of the type CCD, lighting is done using a source halogen or fluorescent light, and normal lighting is transmitted by a ring of optical fibers arranged around the camera lens, while the lighting lateral is transmitted by optical fibers arranged on either side of the glue film.
- the invention aims to replace the overmolding by a collage which presents an ease of realization with the possibility of touching up the failures of manufacturing, thereby reducing the production cost of amplifier discs.
- bonding requires perfectly controlled implementation processes to eliminate faults (scratches, dust, bubbles air, delamination) generating parasitic faults. This is why bonding must be checked as soon as disc obtained and we opted for a control process by image analysis to map the defects in the optical bonding between the cladding and the disk.
- a film of glue represents as part of the invention an area of the order of 800 mm x 40 mm to the interface of the two glasses.
- the method according to the invention makes it possible to detect and to measure with a resolution of the order of 5 ⁇ m, the glue film defects, locate and memorize the position of these defects on the surface analyzed and calculate the incidence of these defects compared to the total area examined.
- Figure 1 a sectional view partial of a laser amplifier disc 1 comprising a disc 2 in neodyn-doped phosphate glass and cladding 3 in copper doped phosphate glass. Adjacent faces respectively 4 and 5 of disc 2 and siding 3 have an inclination ⁇ of 1.6 ° relative to a direction D orthogonal to the surface of the disc 2. This angle tilt is necessary to improve the reduction of parasitic amplification phenomena.
- the faces 4 and 5 are bonded to each other using a film 6 of epoxy type glue to secure the disc 2 and the cladding 3.
- the film 6 must be transparent to photons and deposited continuously on a small thickness.
- a thickness e of between 5 and 35 ⁇ m, more specifically between 20 and 30 ⁇ m, and advantageously of the order of 25 ⁇ m can be envisaged.
- the bonding process itself is completely classic.
- the epoxy resin is spread on side 4 and / or side 5 regularly to obtain a as constant thickness as possible and facilitate bubble-free collage. Image acquisition allows control the quality of the bonding.
- the cladding 3 and the disc have a thickness g of approximately 40 mm and a length of approximately 800 mm.
- the performance of the amplifier disc 1 is closely linked to the quality of the bonding. This is why another aspect of the invention lies in the control of the film 6 of epoxy adhesive.
- the inclination ⁇ of the bonded surfaces 4 and 5 prevents constant focusing over the entire surface to be checked. This problem is solved by the method according to the invention illustrated in FIG. 2.
- the cladding 7 is disposed at a distance of a few millimeters from the cladding 3 compatible with the development of the objective 9 of a camera 8.
- the assembly formed by the two claddings 3 and 7 constitutes a blade with parallel faces thick h .
- the camera 8 is provided with a linear sensor 10 and it is arranged to receive a light beam E 'normal to the face 5' and to the film 6.
- the camera 8 is offset by the angle ⁇ relative to a vertical direction on which the amplifying disc 1 is aligned. In this way, the path difference between all the rays is zero, so that the sharpness is ensured at all points of the sensor 10.
- FIG 3 there is shown schematically an installation to identify faults in bonding 11, for example scratches, air bubbles or dust, disc 2 fitted with its cladding 3 and 7.
- the camera 8 is placed vertically on the disc 2 and the glue film 6 is lit by a ring 12 of fibers optics arranged coaxially to the lens 9 of the camera 8 and / or by optical fibers 13 arranged laterally compared to the adhesive film 6, these fibers being powered by a 14 halogen or fluorescent source connected to conductors 15 and 16.
- a 14 halogen or fluorescent source connected to conductors 15 and 16.
- FIG 4 there is shown a test bench discs 2 which are brought by a system of linear displacement 17 in the vicinity of which is installed a gantry 18 on which the camera is fixed 8.
- the displacement system can inversely move the camera relative to the disc.
- the lighting can be simplified and illuminate only the view part by the camera.
- Amplifier disc 2 is shown here in the form of a rectangular parallelepiped on the sides of which the siding 3 was glued with the adhesive film 6 which is illuminated by all of the optical fibers 13 placed so as to illuminate this film on both sides glue.
- the images received by the camera 8 are transmitted to a microcomputer 19 which processes the following images an algorithmic sequence.
- the image is scanned all first in gray and undergoes a thresholding operation, a hole filling operation and finally an operation detection and measurement.
- Thresholding is a transformation which allows to extract a phase of the image by gray level discrimination.
- the coded image is transformed on 256 gray levels into a binary image.
- the hole filling operation ensures that all pixels below the detected defects are actually counted during measurements by counting.
- the faults highlighted by the lighting and revealed by the thresholding.
- the measurement operation allows viewing and to store all the measurements inherent in faults after taking care to calibrate the image by the observation of a test pattern.
- the simplicity of this treatment due to the quality of the acquisition makes it possible to limit considerably the processing time and therefore the time control.
- a bonding of this type is acceptable on the plan industrial.
- the collage must be made on the four sides of the clad disc.
- Cartography i.e. the number of faults per zone, will be compared to that specified for acceptance or rejection of discs.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Manufacturing Optical Record Carriers (AREA)
- Lasers (AREA)
Abstract
Description
- à réaliser une lame à faces parallèles en disposant au voisinage du bardage collé un bardage supplémentaire identique en position inversée pour obtenir une incidence normale à la direction d'observation,
- à éclairer normalement le film de colle à travers les deux épaisseurs de bardage,
- à repérer à l'aide d'une caméra les défauts de collage des deux verres collés, et
- à numériser l'image obtenue en niveaux de gris pour repérer les défauts du film de colle et mesurer leur taille.
- la figure 1 est une vue en coupe partielle d'un disque selon l'invention,
- la figure 2 est une représentation schématique des moyens pour rattraper le décalage lié à l'inclinaison du bardage pour la mise en oeuvre du procédé,
- la figure 3 représente schématiquement l'installation de contrôle pour la mise en oeuvre du procédé, et
- la figure 4 est un exemple de réalisation d'un poste de contrôle pour la mise en oeuvre du procédé.
Défauts détectés | 24 |
Surface minimale | 2,87574.102 µm2 |
Surface maximale | 1,16611.105 µm2 |
Somme des surfaces défectueuses | 1,78200.105 µm2 |
Surface totale analysée | 1,10428.107 µm2 |
Pourcentage de défauts dans l'image | 1,61372 % |
Claims (9)
- Disque amplificateur laser comprenant un verre phosphate (2) dopé au néodyne et un bardage (3) constitué d'un verre phosphate dopé au cuivre destiné à piéger les photons parasites, caractérisé en ce que l'assemblage des deux verres (2, 3) est obtenu à l'aide d'un film de colle (6) d'épaisseur comprise entre environ 5 et 35 µm.
- Disque amplificateur laser selon la revendication 1, caractérisé en ce que le film de colle (6) est constitué par une couche de résine époxy.
- Disque amplificateur laser selon la revendication 1 ou 2, caractérisé en ce que le film de colle (6) présente une épaisseur comprise entre 20 et 30 µm environ.
- Disque amplification laser selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le film de colle (6) présente une épaisseur voisine de 25 µm.
- Procédé pour contrôler le collage du bardage (3) d'un disque amplificateur laser selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il consiste :à réaliser une lame à faces parallèles en disposant au voisinage du bardage collé (3) un bardage supplémentaire (7) identique en position inversée pour obtenir une incidence normale à la direction d'observation,à éclairer normalement le film de colle (6) à travers les deux épaisseurs du bardage (3, 7),à repérer à l'aide d'une caméra (8) les défauts de collage des deux verres collés (2, 3), età numériser l'image obtenue en niveaux de gris pour repérer les défauts dans le film de colle (6) et mesurer leur taille.
- Procédé selon la revendication 5, caractérisé en ce qu'il consiste à éclairer également latéralement le film de colle (6) de part et d'autre de celui-ci.
- Procédé selon la revendication 5 ou 6, caractérisé en ce qu'il consiste à utiliser une caméra (8) du type CCD.
- Procédé selon l'une quelconque des revendications 5 à 7, caractérisé en ce qu'il consiste à éclairer le film de colle (6) à partir d'une source lumineuse (14) halogène ou fluorescente.
- Procédé selon la revendication 8, caractérisé en ce qu'il consiste à transmettre l'éclairage normal par un anneau (12) de fibres optiques monté autour de l'objectif (9) de la caméra (8), et à transmettre l'éclairage latéral par des fibres optiques (13) disposées de part et d'autre du film de colle (6).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9712467 | 1997-10-07 | ||
FR9712467A FR2769417B1 (fr) | 1997-10-07 | 1997-10-07 | Disque amplificateur laser et procede de controle du collage du disque |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0908986A2 true EP0908986A2 (fr) | 1999-04-14 |
EP0908986A3 EP0908986A3 (fr) | 1999-06-16 |
Family
ID=9511899
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98402363A Withdrawn EP0908986A3 (fr) | 1997-10-07 | 1998-09-25 | Disque amplificateur laser et procédé de contrÔle du collage du disque |
Country Status (3)
Country | Link |
---|---|
US (1) | US6069693A (fr) |
EP (1) | EP0908986A3 (fr) |
FR (1) | FR2769417B1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004071989A1 (fr) * | 2003-02-10 | 2004-08-26 | Imerys Pigments, Inc. | Procede de traitement d'une suspension aqueuse de kaolin |
DE50310520D1 (de) * | 2003-07-31 | 2008-10-30 | Sisi Werke Gmbh | Vorrichtung und Verfahren zum Überprüfen eines aufgeklebten Gegenstandes |
US8225664B1 (en) * | 2007-10-17 | 2012-07-24 | Lsp Technologies | Lamb waves for laser bond inspection |
ITUB20150295A1 (it) * | 2015-03-11 | 2016-09-11 | Borla Ind | Procedimento per verificare l'unione fra due componenti di un dispositivo medicale |
US9626754B2 (en) * | 2015-05-28 | 2017-04-18 | Jabil Circuit, Inc. | System, apparatus and method for dispensed adhesive material inspection |
KR20200094875A (ko) * | 2019-01-30 | 2020-08-10 | 삼성디스플레이 주식회사 | 접착 결함 검출 장치 및 이를 이용한 검출 방법 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4849036A (en) * | 1987-11-02 | 1989-07-18 | The United States Of America As Represented By The United States Department Of Energy | Composite polymer-glass edge cladding for laser disks |
-
1997
- 1997-10-07 FR FR9712467A patent/FR2769417B1/fr not_active Expired - Fee Related
-
1998
- 1998-09-25 EP EP98402363A patent/EP0908986A3/fr not_active Withdrawn
- 1998-09-28 US US09/161,531 patent/US6069693A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4849036A (en) * | 1987-11-02 | 1989-07-18 | The United States Of America As Represented By The United States Department Of Energy | Composite polymer-glass edge cladding for laser disks |
Also Published As
Publication number | Publication date |
---|---|
US6069693A (en) | 2000-05-30 |
FR2769417A1 (fr) | 1999-04-09 |
EP0908986A3 (fr) | 1999-06-16 |
FR2769417B1 (fr) | 2000-02-11 |
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